Grandstream Networks GSM gateway - Manual (Page 24)

Februaray-2006 Page 24 / 42
MasterVoIP
VoIP to GSM Gateway
Voice Frames per
TX
This field contains the number of voice frames to be transmitted in a single
packet. When setting this value, the user should be aware of the requested
packet time (used in SDP message) as a result of configuring this parameter.
This parameter is associated with the first vocoder in the above vocoder
Preference List or the actual used payload type negotiated between the 2
conversation parties at run time.
e.g., if the first vocoder is configured as G723 and the “Voice Frames per TX”
is set to be 2, then the “ptime” value in the SDP message of an INVITE request
will be 60ms because each G723 voice frame contains 30ms of audio.
Similarly, if this field is set to be 2 and if the first vocoder chosen is G729 or
G711 or G726, then the “ptime” value in the SDP message of an INVITE
request will be 20ms.
If the configured voice frames per TX exceeds the maximum allowed value, the
phone will use and save the maximum allowed value for the corresponding first
vocoder choice. The maximum value for PCM is 10(x10ms) frames; for G726,
it is 20 (x10ms) frames; for G723, it is 32 (x30ms) frames; for G729/G728, 64
(x10ms) and 64 (x2.5ms) frames respectively.
Fax Mode T.38 (Auto Detect) FoIP by default, or Pass-Through (must use codec
PCMU/PCMA)
User ID is phone
number
If the VoIP Client ATA has an assigned PSTN telephone number,
then this field will be set to “Yes”. Otherwise, set it to “No”. If
“Yes”, a “user=phone” parameter will be attached to the
“From” header in SIP request.
SIP Registration This parameter controls whether the IP phone needs to send REGISTER
messages to the proxy server. The default setting is “Yes”.
Unregister On
Reboot
Default is No. If set to Yes, the SIP user’s registration information will be
cleared on reboot.
Registration
Expiration
This parameter allows the user to specify the time frequency (in minutes) the
phone will refresh its registration with the specified registrar. The default
interval is 60 minutes (or 1 hour). The maximum interval is 65535 minutes
(about 45 days).
Early Dial This parameter controls whether the phone will attempt to send an early
INVITE each time a key is pressed when a user is dialing a number. If set to “Yes”, an
INVITE is sent using the dial-numbers collected so far; Otherwise, no
INVITE is sent until the “(Re-)Dial” button is pressed or after about 5 seconds
have elapsed if the user forgets to press the “(Re-)Dial” button.
The “Yes” option should be used ONLY if there is a SIP proxy configured and
the proxy server supports 484 Incomplete Address responses. Otherwise, the call
will most likely be rejected by the proxy (with a 404 Not Found error).
Please note that this feature is NOT designed to work with and should NOT be
enabled for direct IP-to-IP calling.